Some what happens if ... scenarios

What we look at in the following sections are some common what if questions. For each scenario, the repercussions are examined for an active Q subscription when a record is inserted.

If MQ is stopped on each server

What we will test in this section is what happens if the Queue Manager is stopped. We will test this using unidirectional replication (Refer to Appendix A for details on how to set up unidirectional replication).

1. 1. First let's make sure that replication is working. From CLP-A, issue:

   $ db2 "insert into eric.t1 values (5,5,'H')"

   From CLP-B, issue:

   $ db2 "select * from fred.t1"
   C1 C2 C3
   ----------- ----------- ----------
   5 5 H
   1 record(s) selected.

   We should see one record in FRED.T1 on DB2B.

   We can see that the unidirectional Q replication setup is working.

2. 2. Now we can continue with our test. Stop the WebSphere MQ on the source server.

   $ endmqm -p QMA

   WebSphere MQ queue manager 'QMA' ending.

   WebSphere MQ queue manager 'QMA' ended.

   Is the Q subscription...